Automatic self-propelled nailing machine



March 16, 1965 R. w. ELLIOTT 3,173,593

AUTOMATIC SELF-PROPELLED NAILING MACHINE Filed Oct. 8, 1962 4 Sheets-Sheet l Q @La 1 :Tf- N Si z Q K" 0; G- b I l; n :T E Q 23 SS i JWIN.

March 16, 1965 R. w. ELLIOTT AUTOMATIC SELF-PROPELLED NAILING MACHINE 4 Sheets-Sheet 2 Filed Oct. 8, 1962 www E B NQ b N h R %N\ \NQN HMS MQN .@.NEN |\,N am Il A ,M/ T N l] E .1 |l Q d H| 1 MN--. s w IMSI l I N I um A. Ar AIA. A@ A| f, i Q s Q INVEN TOR. Rober W. Ell/'0 ff March 16, 1965 R. w. ELLIOTT 3,173,593

AUTOMATIC SELF-PROPELLED NAILING MACHINE Filed Oct. 8, 1962 4 Sheets-Shedl 3 INVENTOR. Robe/f IM E//l'o H March 16, 1965 R. w. ELLIOTT AUTOMATIC SELF-PROPELLED NAILING MACHINE 4 Sheets-Sheet 4 Filed Oct. 8, 1962 QM M @Trop/mf s.

United States Patent C) 3,173,593 AUTGMATIC SELF-PRPELLED NALNG MACHINE Robert W. Elliott, Emporia, Kans., assigner to Elliott, Inc., Emporia, Kans., a corporation of Kansas Filed Get. 8, 1962, Ser. No. 228,809 7 Claims. (Cl. 227-111) This invention relates to an automatic nailing machine, and more particularly, to an automatic, self-propelled nailing machine which sorts and drives nails into a flat roof or the like.

It is the most important object of this invention to provide an automatic machine for driving nails of the type commonly used in placing coverings on flat roofs, decks or the like, which machine has a hopper for receiving the nails to be driven, means for delivering the nails from the hopper to a position whereby the same can be driven, and an automatically actuated hammer for driving the nail into the roof, deck or the like.

Yet a further aim of this invention is to provide an automatic nailing machine which has a substantially cylindrical hopper rotatably mounted upon the frame of the machine, there being a motor carried by the frame for rotating the hopper, the hopper receiving a plurality of nails which are to be driven and having means therein for separating the nails and feeding the same to one end of a nail delivery chute which is in communication with the hopper.

A yet further object of this invention is to provide in an automatic nailing machine, a hammer in the nature of a reciprocable rod, which hammer has an actuator assembly coupled therewith through a clutch assembly whereby the hammer may be operated at predetermined intervals to drive nails at selected spacings along a roof, deck or the like.

Yet another aim of this invention is to provide, in an automatic nailing machine, a power train assembly coupled initially with the motor for the machine, which motor is carried by the frame of the machine, which power train assembly operably couples the motor with the hopper, as Well as the actuator wheel of the machine, there being a clutch unit interposed within the power train assembly whereby the same may be interrupted and rotation of the hopper and driving of the actuator wheel terminated.

A yet further object of this invention is to provide an automatic nailing machine which can be self-propelled as a result of a coupler assembly associated with one of the wheels of the frame of the machine, which coupler assembly is operable to couple the said wheel of the machine with the power train assembly originating with the motor whereby the motor may be utilized to propel the machine, there being a control for said coupler to allow the machine to be used without self-propulsion.

Other objects of this invention include details of construction of the hopper; the means for separating the nails within the hopper; the means by which the nails are fed from the hopper to a point adjacent the hammer of the machine; the details of construction of the actuator assembly and its components, as well as other structural features which will become apparent from the lfollowing specification and accompanying drawings, wherein:

FIGURE l is a side elevational view of the automatic self-propelled nailing machine, parts being broken away to reveal details of construction;

FIG. 2 is a front elevational view of the machine, parts being broken away;

FIG. 3 is a fragmentary, bottom plan View of the front portion of the machine;

FIG. 4 is a fragmentary, elevational View of the hopice per, parts being broken away to reveal details of construction;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is a fragmentary, bottom plan view showing the hopper nail exit and one end of the nail delivery chute;

FIG. 7 is a fragmentary, front elevational View showing the hopper nail exit;

FIG. S is a sectional View through the nail exit portion of the hopper;

FIG. 9 is a vertical, sectional view through the nail chute;

FIG. 10 is an enlarged, fragmentary, vertical, sectional View of the jackshaft, ilywheel clutch assembly and associated parts;

FIG. 1l is an enlarged, horizontal, sectional view showing the linkage associated with the actuator wheel;

FIG. l2 is an enlarged, fragmentary view illustrating the nail-carrying foot and associated parts; and

FIG. 13 is a fragmentary, sectional view of a portion of the actuator wheel.

The automatic nailing machine is broadly designated by the numeral 10 and includes as its primary components, a wheeled frame 12, a hopper 14 rotatably carried by a portion of the frame 12, a motor or prime mover 16, a nail delivery chute 18, a hammer 20, and an actuator assembly 22.

The frame 12 is provided with suliicient supporting wheels such as front wheels 24 and 26, and rear wheels 28, one of which is shown, the wheels 24-28 serving to support the frame 12 and, more particularly, a platform 30 which forms a part thereof, the frame also including hopper-supporting means in the form of a normally forwardmost, substantially vertically disposed post 32, and a rearwardly extending support member 34 secured at its upper end to post 32 and at its lower end to the platform 3l), post 32 and member 34 being substantially in the form of an inverted V, and the member 34 carryf ing a pair of lateral extensions 36 and 38 which are secured to a ring 40 associated with hopper 14. The frame 12 alsov includes an elongated handle 42, conventional in configuration, which is utilized by the operator of the machine, the handle being suitably secured to the frame 12 at one end thereof and having at the opposite end thereof, a clutch unit control 44 and a coupler control 46 for purposes which will hereinafter be made apparent.

It will be noted that wheel 26 is of a larger diameter than wheel 24, the wheel 24 of smaller diameter being carried by the side of `frame 12 adjacent which hammer 20 is disposed, there being an adjuster bolt 48 associated with that portion of frame 12 carrying wheel 24 through shaft 59, whereby the height of platform 30 with respect to the roof or deck 52 may be adjusted through bolt 48 by causing the same to act upon bracket 54 which is pivotally coupled as at 56 to the platform 30 to thereby allow adjustment of the height of the platform and therefore, the hammer 2li with respect to the roof or deck 52.

'The hopper 14 of machine 10 is substantially cylindrical in configuration and has a continuous outer or side Wall 58, and a bottom wall 6l), the outer wall 5S having an inturned, annular iange 62 adjacent the upper edge thereof, said flange being connected to a plurality of spokes 64 which are all connected to a hub 66, the hub 66 being in turn secured to a sleeve 68 telescoped over a driven shaft 76, the shaft 76 serving to rotatably drive the hopper 14 through the means of an adjustable cam unit 72, said cam unit being best illustrated in FIGS. 4 and 5 of the drawings, and consisting of a four-lobe cam 74 secured to the driven shaft -70 and having one indentation thereof normally in engagement with a roller 76, which roller is carried at one end of a bar 78, the opposite end of bar 78 being suitably secured to one of the spokes 64.

A tension adjustment assembly 80 is coupled with bar 78 as illustrated in FIGS. 4 and 5, whereby the engagement of roller 76 with cam 74'may be closely regulated to insure that rotation of shaft 70 will cause corresponding rotation of hopper 14, but also to assure that if hopper 14 should become jammed or otherwise prevented from rotating in its normal fashion, the driven shaft 70 which would continue `to rotate, will merely serve to rotate cam 74 and allow roller 76 to ride over the edge surfaces thereof, thus preventing the rotative force of shaft 70 and its carn 74 from being transmitted to the hopper 14. The foregoing serves not only as a safety device, but also operates to prevent continued feeding or attempted feeding of nails from hopper y14'to the delivery'chute 18 when the chute is full.

A conical plate 82 is disposed within hopper 14 as shown in FIGS. 4 and 5, the conical plate 82 having its apex portion proximal to the open top of hopper 14 and having its marginal edge 84 secured to the bottom wall 60 of hopper 114 at a point spaced inwardly from the peripheral edge of bottom wall 60 and the point on said bottom wall normally underlying the side wall 58 whereby to deiine a trough 86 ybetween the marginal edge 84 of the conical plate y82 and the side wall 58 of hopper 14.

Hopper |14 has disposed interiorly thereof, and around the peripheral edge thereof, a plurality of separator units 88, also best illustrated in FIGS. 4 and 5 of the drawings, said separator units being designed and disposed to provide slots such as 90 therebetween, said separator units being substantially rectangular in configuration and formed from a sheet of metal or the like A ring 40 surrounds hopper 14 exteriorly thereof, said ring 40 supporting an annular skirt 92 which likewise surrounds the bottom portion of hopper 14-except for an opening 94 formed in the skirt 92, which opening -94 corresponds with a slot 96 formed in ring 40, which slot 96 places hopper 14 into communication with nail delivery chute 18.

Thus, when a plurality of nails, such as 98, are placed into hopper 14 and the same is caused to rotate through actuation of motor 16 at a determined speed as will be hereinafter pointed out, the nails 98 are, due to the disposition of hopper 14, at an angle to the horizontal as illustrated in IFIGS. 1 and 2 and to the provision of conical platey 82, caused to move toward the outer edges of hopper 14 and, more specifically, into trough 86 and thence into the slots l90 between separator units 88, the nails 98 assuming the head-down position within said slots as shownin IFIGS. 4 and 5 of the drawings. As the nails 98 are received in slots `90 and the hopper 14 rotates, the same are retained within the hopper 14 as a result of the engagement of thershank of the nails 98 with the inner edge 100 of ring 40,-the same being so retained until the hopper moves the nail into a position in alignment with slot 96, the nail then passing by gravity along the slot 96 and through the yopening 94 in skirt 92 and thence downwardly along nail delivery chute i18.

Details of the nail exit from hopper 14 and the communication of chute 18 with'hopper 14are shown in FIGS. 6, 7 and 8, and it will be noted that theV delivery chute 18 consists of three rodssuch as 102, spaced apart in substantially triangular relationship whereby the nail 98 as it leaves hopper 14 through slot 96, is initially supported in a head-down position by a T-shaped plate 104, the plate 104 then being replaced by a rod 102 as clearly shown in FIGS. 4 and 6 whereby the rod 102 may then assume support of the head of the nail, the shank being retained in position between the other rods 102.

The delivery chute 18 is twisted along its path from -hopper 14 toa point adjacent hammer 20v/hereby the nail may be inverted to a head-upy and shank-down position as illustrated for instance, in FIG. 9 of the drawings, which is a sectional View of the nail chute ata point along its length subsequent to the twisting of the chute and the inversion of the nail 98.

The nails 98 are fed by hopper |14 intothe delivery chute 1S as hereinabove described, and pass along Said delivery chute through the force of gravity to the other end 106 of chute -18 where they are retainedrin position by a suitable holding lip or the like for subsequent transportation to engagement with the head of the hammer and driving into the deck 52, all as will be hereinafter described.

As best seen in IFIGS. 1 and 2 of the drawings, the motor or prime mover 16 has a driving shaft 108 operated thereby, the shaft`l108 lcarrying a pulley 110 which has a belt 112 trained thereover, belt 112 also being trained over a pulley 114 carried by a jackshaft \116, the jackshaft being carried for rotation by the frame 12 and, more par- Y Iticularly, by a vertical support 118 and a supporting bracket y.120, the shaft k116 being suitably journaled in a bearing'such as 122 carried by support `118 and a similar bearing 124 carried by bracket 120.

Jackshaft 116 carries a second pulley 126 which has a belt 128 trained thereover, which belt 128 drives a flywheel 130, the ywheel 130 being rotatable about a shaft 132 carried by support 118 and a corresponding spaced Support 134, the supports 118 and 134 being suitably secured to platform 30 of frame 12.

Jackshaft 116 vhas a third pulley 136 keyed thereto, which pulley 136 has a belt 138 trained thereover, the belt y138 being also trained over a sprocket 140 of a gear box 142. A clutch unit 144 is also carried by shaft 116 at a point between pulleys 126 and 136, said clutch unit being in the nature of means to vary the diameter of pulley 136 wherebypto render the same ineffective to drive belt 138 and thereby sprocket 140, thus interrupting the power train from motor 16to gear box 142. Clutch unit 144 is operated `by clutch control 44 Which isV coupled thereto as by a flexible cable 146.

The gear box 142 contains suitable gearing whereby to drive a sprocket 148 vwhich is provided with two sets of teeth, the first set of teeth being in engagement with a chain 150, thechain alsobeing in engagement with a sprocket 152` which is suitably secured to the driven shaft 70 for hopper ,14. Thus, sprocket 148, chain 150 and sprocket 152 combineto drive hopper 14, the shaft 70 being journaled in `suitable bearings carried by support member 34. The other pair ofV teeth on sprocket 148. have trained thereover a chain 154, which chain 154 is also trained over a sprocket-156, which sprocket 156 is secured to and drives a shaft 158, shaft 158 extending through an opening 160 in platform 30 and having a bevel gear 162 secured to the end thereof opposite thatto which sprocket 156is coupled. Bevel gear 162 is in mesh with a gear 164 carried by a shaft 166, vall as best seen in FIG. 3 of the drawings, Which'shaft 166 is suitably supported by a depending segment 168 of platform 30. Gear 164 is in mesh with another bevel gear 170, which gear 170 is secured to a shaft 172, the .shaft 172 driving actuator wheel 174, the shaft 172 also being supported bysegment A168 and the actuator wheel being disposed in the position shown in FIGS. 2 and 3 of the drawings.

As is apparent, the shaft 166 carrieswheel 26 of machine 10 and also carries a coupler, broadly designated as 176, which coupler is in the nature ofla clutch and includes a sleeve member 178 having teeth 180, the sleeve 17 8 being axially slidable with respect to shaft 166 through means of a flexible cable 182 and a spring 184, the cable 182 being coupled with coupler controll 46. The wheel 26 carriesa clutch plate 186 having teeth 188, and it will now be apparent that through the utilization of coupler 176, the power transmitted from gear box 142 through shaft 158 and 166 may be coupled with wheel 26, through the operation of control 46, whereby to cause the machine 10 to-be self-propelled.

Thus, it is apparent that motor 16 is utilized not only to rotate hopper 14 through the power train assembly above described, but is also utilized to render the machine self-propelled as above described, and also operates actuator wheel 1'74 in a manner which will be hereinafter described.

It is also apparent that the machine 10 may be either self-propelled through the utilization of coupler 176 actuated by control 46, or, if desired and appropriate, the machine 10 may be manually operated in a free-wheeling manner. Further, the clutch unit 144 may be operated through control 44 to discontinue the flow of power from motor 16 to gear box 142 and thereby terminate not only rotation of the hopper 14, but also the driving of actuator wheel 174. In this regard, it will be appreciated that the speed of rotation of hopper 14 and the driving speed of actuator wheel 174 is controlled virtually directly by the speed of motor 16 and it is to be preferred that this be set at a predetermined level.

The actuator wheel 174 is rotated by shaft 172, and reference to FIGS. 2 and 11 of the drawings reveals the manner in which the actuator Wheel causes the hammer 20 to be operated at predetermined intervals. Thus, as actuator wheel 174 rotates, the lugs 190 extending outwardly from the hub 192 thereof, move in a counterclockwise direction viewing FIG. 2 of the drawings, and pass above platform 30 through an opening 194 formed therein, the lugs 190 sequentially moving into engagement with a roller 196 forming a part of linkage broadly designated as 198, the roller being carried between the side members 200 of a bar 202, the side members 200 defining a slit 204 within which the roller 196 is disposed and into which lugs 190 move upon the rotation of actuator wheel 174. Linkage 198 also includes a pair of springs 286 secured at one end thereof to a clamp 208, and at the other end thereof to a pin 210, which pin carries roller 196. A rod 212 is secured to the end of bar 202 opposite that to which clamp 208 is secured and carries an upstanding ear 214, said ear 214 being more directly carried by a second rod 216 which is telescoped within rod 212 for adjusting purposes, the rod 216 being threadably received within rod 212 in order that the same may be held in a lixed, adjusted position.

Thus, as lugs 190 of actuator wheel 174 strike roller 196, the linkage 198 is caused to move to the left, as viewed in FIG. 11, and when this is accomplished, the ear 214 strikes a crank 218 illustrated in FIG. 10 whereby to swing the same about a pivot point 220. Also, rod 216 carries a substantially L-shaped cam 222 which has an edge thereof in engagement with a roller 224, which roller 224 is secured by an arm 226 to a swingable, upstanding post 230, the roller being biased against cam 222 as by a spring 228 coupled with post 230. Post 230 also carries a foot 232 which is coupled thereto and disposed beneath the platform 30, it now being apparent that as roller 224 moves along the edge of cam 222, the post 230 is turned, thereby causing a swinging of foot 232, the foot 232 having a nail-receiving notch 234 formed therein adjacent a lip 236, the notch 234 embracing the shank of the nail 98 and swinging the same from its position at the end 106 of chute 18 into a position in engagement with the head 238 of hammer 20, the head 238 being of a suitable magnetized material whereby to retain the head of the nail in engagement therewith.

The foot 232 comprises a pair of sections interconnected by a hinge 233 to allow downward movement of the outermost section in case foot 232 should accidentally remain below hammer 20 during the downward movement thereof.

As linkage 198 moves to the right, as viewed in FIG. 11, under the inuence of springs 206, which springs exert a biasing force on linkage 198 after the lug 190 moves out of engagement with roller 196, the upstanding ear 214 again strikes crank 218 moving the same in a counterclockwise direction viewing FIG. 10, and thus causing one arm of the crank 218 which is in engagement with a pin 240 carried by a shaft 242, to move the shaft 2,42 downwardly.

The foregoing serves to actuate or place in engagement, a clutch assembly broadly designated as 244 which is carried by shaft 132 adjacent flywheel 130, the downward movement of shaft 242 removing one end thereof from a spiral groove 246 formed in the exterior surface of a clutch sleeve 248 and allowing said sleeve to move axially of shaft 132 and to the right, as seen in FIG. l0, under the influence of springs 250 whereby the teeth of sleeve 248 may move into engagement with corresponding teeth on a clutch plate 252 secured to the face of continuously rotating flywheel 130.

Inasmuch as clutch sleeve 248 is keyed to shaft 132 as by hexagonal fitting 254, the interengagement of clutch sleeve 248 and clutch plate 252 will cause rotation of shaft 132 and thus rotate in a complete circle, cam 256 which is suitably secured to shaft 132.

It will be noted that shaft 242 is normally biased upwardly as seen in FIG. 10, by means of a spring 258 and thus, after the end of shaft 242 is initially removed from spiral groove 246 in sleeve 248, and inasmuch as ear 214 has now moved out of engagement with crank 218, shaft 242 will be biased upwardly against the exterior surface of sleeve 248, and as said sleeve rotates as a result of the interengagement of sleeve 248 and plate 252, the end of pin 242 adjacent the sleeve 248 will again become aligned with groove 246 and move thereinto, the spiral configuration of groove 246 and the seating of shaft 242 therein, then causing the sleeve 248 to move to the left as viewed in FIG. l0, and thereby bring clutch assembly 244 into disengagement. y As the cam 256 is swung in the manner above described, the edge camming surface thereof strikes a roller 260 carried at the normally uppermost end of a rod 262, which in effect forms hammer 20. As shown in FIGS. 1 and 2, the rod 262 rides within a sleeve 264, which sleeve has a spring 266 surrounding the same, the spring 266 being in engagement with a pin 268 carried by the rod 262 whereby to normally bias the same upwardly.

In operation, nails 98 are placed into the hopper 14, separated therein and fed into the chute 18 in a manner fully described above, the nails 98 accumulating in chute 18, the lowermost nail in the chute resting against lip 236 of foot 232. As the actuator wheel 174 revolves, the lugs thereof sequentially strike roller 196 at predetermined intervals, the engagement of said lugs 190 with roller 196 causing actuation of the linkage assembly 198 whereby to swing the foot 232 through its path of travel, thereby moving a nail from the lower end of chute 18 into engagement with the magnetized head 238 of hammer 20. As the linkage 198 moves to its initial position, that is to the right as seen in FIG. 11, the crank 218 is struck by ear 214, thereby causing engagement of the clutch assembly 244 and causing cam 256 to strike roller 260 and thence drive the nail carried by the head 238 of hammer 20, into the roof or deck 52.

It will be appreciated from the foregoing that the operation of the machine is fully automatic and that nails may be driven at a predetermined interval or spacing along the deck 52. This is accomplished through adjustment of actuator wheel 174, and more particularly, lugs 190 thereof which are pivotal as seen in FIG. 13 of the drawings, whereby certain of the lugs, if desired, may be moved to a position where the same do not engage roller 196 upon the rotation of actuator wheel 174. Thus, for instance, if a 6-inch spacing between the nails to be driven is desired, all of the lugs 190 of wheel 174 are utilized, but if a 12 or 18-inch spacing between the nails is desired, certain of the lugs may be pivoted to the dotted line position shown in FIG. 13, thereby accomplishing a spaced positioning of the nails.

Thus, there is presented a fully automatic nailing machine which may be utilized either in a self-propelled manner, or under manual operation, and which machine automatically separates, feeds and drives nails in a predetermined spacing in a roof, deck or the like. g

Having thus. described the invention, what is claimed the bottom thereof, the apex of said plate extending awayV` from said bottom; a nail delivering chute having one end in communication with said hopper for receiving nails therefrom; a hammer carried by said frame for driving the nails, the other end of the delivery chute being disposed adjacent said hammer; and means for carrying nails from said other end of the delivery chute into engagement with the head of the hammer.

2. An automatic nailing machine as set forth in claiml 1, said separator units being disposed aroundV the peripheral edge of the bottom Wall of said hopper, thereVr being a trough formed between said separator units and the marginal edge of said conical plate.

3. An automatic nailing machine as set forth in claim 2 wherein said hopper is inclined with respect to the horizontal.

4. An automatic nailing machine comprising a wheeled frame; a motor for the machine carried by the frame;

a hopper for receiving the nails to be driven rotatably.

carried by the frame and rotated by the motor; a nail delivery chute having one end, thereof in communication with the hopper for receiving nails therefrom, there being nail separator means within the hopper for separating and delivering nails to said one end f the chute; a hammer 8 carried bythe frame adjacent the other end of the chute; an actuator assembly carried by the frame and driven by the motor, said assembly including an actuator wheel driven by said motor, a clutch assembly and linkage oper-- able by the', actuator WheelV to move the clutch into engagement atpreselected intervals and a cam coupled with said clutch assembly and operable upon engagement there-- of to strike said hammer; and a swingable foot operable by said linkage for lcarrying anail'from said other endy of the chute into engagement with the head of the hammer.

5. An automatic nailing machine as set forth in claim' 4 wherein said hammer is in the form of a reciprocablev rod, there being a roller'carried by the end thereof adja v cent said cam to be struck thereby.

6. An automatic nailing machine as set forth in claim 4, there being a power train assembly coupling said motor with said hopper and said actuator wheel; and a clutch unit interposed therein between the motor and said hopper and actuator wheel whereby driving of the same mayv b e terminated.

e 7. An automatic nailing machine as set forth in claim-' 6, there being means for coupling said power train assemv bly with one of the wheels of the frame whereby to cause the machine to be self-propelled.

`References Cited by the Examiner UNITED STATES PATENTS 329,268 10/85 Brosnan 1-6 1,509,492 9*/24 Schaub 1--46 1,693,290 11/28 Fawcett 1-44.6 2,379,826 7/45 Peterson 1-46 2,457,984 1/49 Dougherty 1-44.6 2,660,724 12/53 Thompson 1-1 GRANVILLE Y. CUSTER, IR., Primary Examiner. 

1. AN AUTOMATIC NAILING MACHINE COMPRISING A WHEELED FRAME; A MOTOR FOR AND SAID MACHINE CARRIED BY SAID FRAME; A SUBSTANTIALLY CUP-SHAPED HOPPER FOR RECEIVING THE NAILS TO BE DRIVEN ROTATABLY CARRIED BY SAID FRAME AND ROTATED BY A SHAFT DRIVEN BY SAID MOTOR; AN ADJUSTABLE CAM UNIT COUPLING SAID DRIVEN SHAFT WITH SAID HOPPER, SAID HOPPER HAVING A PLURALITY OF SEPARATOR UNITS DISPOSED INTERIORLY THEREOF; A CONICAL PLATE WITHIN SAID HOPPER AND OVERLYING THE BOTTOM THEREOF, THE APEX OF SAID PLATE EXTENDING AWAY FROM SAID BOTTOM; A NAIL DELIVERING CHUTE HAVING ONE END IN COMMUNICATION WITH SAID HOPPER FOR RECEIVING NAILS THEREFROM; A HAMMER CARRIED BY SAID FRAME FOR DRIVING THE NAILS, THE OTHER END OF THE DELIVERY CHUTE BEING DISPOSED ADJACENT SAID HAMMER; AND MEANS FOR CARRYING NAILS FROM SAID OTHER END OF THE DELIVERY CHUTE INTO ENGAGEMENT WITH THE HEAD OF THE HAMMER. 